Gargaphia tiliae

Distinguished from other North American lace bugs by its association with Tilia host plants; adults, eggs, and nymphs are found specifically on the undersides of leaves. The species exhibits end-to-end mating posture at a 35–40° angle, which may aid in field identification when observed. Parental care behavior, with adults guarding eggs and broods, separates it from many non-guarding tingid species.

Deciduous forest and urban areas where Tilia (basswood/linden) occurs; active stages aggregate on undersides of host leaves, while overwintering occurs in leaf litter on the ground.

North America: documented from Ontario and Québec, Canada, and widely across the United States including records from Alabama, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas; also present in Central America.

Active April or May through October; adults overwinter in leaf litter and become active in spring; new generation of adults appears in late October before moving to overwintering sites.

Host-specific feeder on Tilia species (basswood/linden); feeding occurs on the undersides of leaves.

• Tilia - obligate hostHost-specific; all life stages restricted to this genus

Univoltine; overwinters as adults in leaf litter in reproductive diapause; becomes active April or May; eggs deposited on undersides of host leaves; nymphs develop through five instars; new adult generation emerges in late October; adults aggregate briefly under leaves before flying short distances to overwintering sites in leaf litter.

Adults and nymphs aggregate on undersides of host leaves or nearby deciduous plants. Exhibits parental care: adults guard eggs and broods. Mating occurs in end-to-end position at 35–40° angle. Adults of new generation fly short distances from host plants to leaf litter overwintering sites in October.

Herbivore on Tilia; feeding damage appears as characteristic stippling on leaf undersides. Parental care behavior may reduce predation and parasitism pressure on eggs and nymphs.

Minor economic significance as a specialist herbivore on ornamental and native Tilia species; not known as a major pest.

• Corythucha juglandisSympatric univoltine lace bug in Ontario and Québec with similar life history (overwintering as adults in leaf litter, host-specific), but restricted to Juglans (walnut) rather than Tilia
• Gargaphia lunulataCongeneric species in South America with similar lace bug morphology, but occurs on Ricinus and other Euphorbiaceae rather than Tilia; lacks the parental care behavior documented in G. tiliae
• Corythaica cyathicollisNeotropical lace bug with similar host-specific feeding on Solanaceae, but lacks parental care and occurs on different host family

• Tingidae
• lace bug
• univoltine
• parental care
• host-specific
• Tilia
• basswood
• linden
• overwintering
• leaf litter
• aggregation behavior

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Hemiptera | Beetles In The Bush | Page 9
• Natural history of Corythucha juglandis and Gargaphia tiliae (Hemiptera: Tingidae) in Ontario and Québec, Canada